If you're eager to get Google Voice text messages pushed to your iPhone (so you don't have to waste texts) but know that's not likely until Apple stops rejecting Google Voice apps for the iPhone, web service Google Voice Growl can help.

The free service integrates with the previously mentioned Prowl iPhone application to send push updates to your iPhone for virtually any kind of application. Unlike our guide to setting up Prowl with Gmail, this service doesn't require you to keep a computer running in the background at all times. To get it working, you'll need to sign in with your Google account, add your Prowl API key (if you're signed into Prowl on your computer, you can get that key here), then set up a Gmail filter that will forward Google Voice SMS messages to the site's special email address. It's a bit convoluted considering how easy it could be if Apple hadn't killed the official Google Voice app, but it's a decent workaround. (View the site for the full instructions.)

If you're concerned about privacy, the site's developer has put together a pretty comprehensive privacy statement. I set my account up with it earlier today and it works like a charm. I still had Google Voice forwarding new SMS messages to my phone, and the Prowl push notification arrived about a second after the forwarded SMS. If you don't want to pay the extra cash for AT&T's unlimited texting plan, this is certainly a viable workaround.